Energy decrement

Fl would be the adhesion tension of the clean solid against the liquid but Ysy—ysL is what is generally measured as adhesion tension. Bangham terms FS, equal to Yso Ysv the surface free energy decrement on saturation (with vapour). 

The recombination process comprises two sequential steps, as illustrated in Fig. 8.1. An excited electron or hole first loses energy by many transitions within the band, in which the energy decrements are small but frequent. This process is referred to as thermalization. The thermalization rate decreases as an electron moves into the localized band tail states and the density of available states is lower. Eventually the electron completes the recombination by making a transition to a hole with the release of a large energy. Recombination lifetimes are generally much longer than the thermalization times, so that the two processes usually occur on distinctly different time scales. 

High logarithmic energy decrement to maximize the energy loss per collision due to low mass number... 

Values of the average logarithmic energy decrement as defined by Eq. (57.15), and of n, the average number of collisions required to moderate a neutron from an initial energy of 2 MeV to thermal energy as defined by Eq. (57.17), for various elements of interest in reactor technology... 

Moderating properties of different compounds scattering cross section for epithermal neutrons (er in barn) absorption cross section for thermal neutrons (average logarithmic energy decrement slowing down power (SDP) (cm ) and moderating ratio (MR)... 

Since is the average logarithmic energy decrement, the number of collisions is... 

Table 3.1. Values of Average Logarithmic Energy Decrement...

Hard sphere average lo irithmic energy decrements (36) for Ha, He, Ar and Xe toward F atoms sure 0.208, O.585,... 

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